body, ul {
    margin: 0
}

ul {
    padding: 0;
    list-style: none;

}

.wrap {
    width: 2500px;
    overflow: hidden;
    position: absolute;
}

.mask {
    position: relative;
    width: 500px;
    height: 200px;
    overflow: hidden;
}

.mask li {
    width: 5.3333rem;
    height: 5.3333rem;
    float: left;
}
.mask li img{
    width: 5.3333rem;
    height: 5.3333rem;
    float: left;
    z-index: 10;
}

.container {
    width: 5.3333rem;
    padding: 5px;
    border: .0267rem dashed deepskyblue;
    margin: 200px auto;
}

.arrow {
    width: 100%;
    position: absolute;
    top: 38%;
    display: none;
}

.arrow .left, .right {
    background-color: rgba(0, 0, 0, .5);
    color: #fff;
    width: 50px;
    text-align: center;
    font-size: 40px;
    border-radius: 38%;
    cursor:pointer;
    z-index: 5;
}

.arrow .left {
    float: left;
    user-select: none;
}

.arrow .right {
    float: right;
    user-select: none;
}

.indicator {
    padding-left: 0;
    position: absolute;
    list-style: none;
    left: 33%;
    top: 70%;
    display: none;
}

.indicator li {
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    cursor: pointer;
    border-radius: 50%;
    background: #fff;
    float: left;
    margin: 0 3px;
}

.indicator li.active {
    background: hotpink;
}